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(Hommel.) JLW. `PYLE 'Q W, MARTIN.

DEVICE FOR MOLDING MOLDS.

Patented Apr.- 80,'1895.

UNITED )Si-ATS PATniwr NOri-Tron.,Y

JOSEPH W. PYLE AND GAYLORD W. MARTIN, OF FORT SCOTT, KANSAS;

SAID'PYLE ASSIGNOR TO SAID DEVICE FOR MOLDING MOLDS.

SPECIFICATION forming part of Letters Patent No. 538,846, dated April 30, 1895.

Application led December 26, 1893. Serial No. 494,799. (No model.)

To a/ZZ whom it may concern: Y

Be it known that we, JOSEPH W. PYLE and GAYLORD W. MARTIN, citizens of the United States, residing at Fort Scott, in the county of Bourbon and State of Kansas, have invented certain new and useful Improvements in Devices for Molding Molds; and we do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

Our invention relates to improvements in devices for molding molds, and it has for one of its objects to provide such a device adapted to form molds of plaster of paris or the like of equal internal diameter at thev bottom and top so that earthenware jars molded therein will be of the same external diameter at the bottom and top and will therefore be adapted to stand firmly on top of each other.

Another object of the invention is to provide a device for molding molds, of a cheap and simple construction and one which may be readily put together and which may be as readily removed from the mold after the formation of the same without danger of breaking it.

Other objects and advantages will appear from the following description and claims when taken in connection with the annexed drawings, in which- A Figure l is a vertical, diametrical section of our improved device with the parts in their operative position. Fig. 2 is a horizontal section taken in the plane indicated by the line 2 2 of Fig. l. Fig. 3 is a sectional, perspective view of a portion of the base plate of our device. Fig. 4 is a perspective view of the core removed. Fig. 5 is a perspective view of a mold formed by our improved device; and Fig. 6 is a detail section taken in the plane indicated by the line :l: of Fig. 4.

Referring by letter to said drawings: A indicates the base of our improved device, which is preferably annular in form and is provided with the rabbeted edge ct, and with the circular groove b (preferably of V-shape in cross section).

B, indicates the outer shell which comprises the two semicircular sections c, which are designed to rest in the rabbet a of the base and are provided at their contiguous edges with lugs d, for the reception of connecting bolts e; and C, indicates the core; the outline of which should be similar to that of the jar which it is desired to form. This core O, is formed in three pieces f, g, and h, and it is closed at one end and has its opposite end shaped to enter the groove b, of the base A, as shown in Fig. l, so as to enable the said groove 6o to hold the sections together. The middle piece or section f, of the core C, is gradually increasedin width toward the open end of the core as shown in Fig. 4, and it also has the edges of its bottom portion f', beveled in- 65 wardly so as to permit of it being easily removed from between the sections g, h, after the plaster of paris of which the mold is formed has set. V

In the practical operation of ourimproved 7o device, the parts are assembled as shown in Fig. l; the sections c, of the shell B, being` connected together and arranged in the rabbets a, of the plate A, and the core sections f, q, and h, being arranged in the circular groove l?, of the base plate, which serves to hold them together and against casual displacement. The

plaster of paris in a plastic state is now poured into the space between t-he shell B, and core O, until said core is entirely covered, and after 8o the plaster of paris has set sufficiently the bolts e, are loosened and the sections c, of the shell B, spread slightly apart when they may be readily removed without injury to the outside of the mold. lt is now necessary to re- 8 5 move the core from the mold, and to do this, the core and mold are lifted off the annular base A, and turned mouth up, after which the core section f, is loosened by any suitable device and raised upward and inward until it 9o is` entirely disengaged from the sections g, h, when it may be quickly removed wit-hout injury to the mold. Y

The removal of the core section f, as is obvious, renders the removal of the sections g, h, very easy and simple, and when they are removed, the plaster of paris mold such as shown in Fig. 5, is ready for use.

Having described our invention, what we claim is l. The herein described mold making device comprising the base plate A, having the circular groove Z9, in its upper side and also having the rabbeted edge a, the sectional shell B,

IOO

adapted to rest in the rabbet of the base plate having the edges of its bottom portion bevand the core C, formed of sections having one eled inwardly, substantially as and for the 1o of their ends shaped to engage the groove b, purpose set forth.

of the base plate, substantially as speoied. JOSEPH W. PYLE.

5 2. A core for mold making devices, com- GAYLQRD WV. MARTIN.

prising the middle sectionf, andthe outer sec- Witnesses: tions g, h, the middle section ybeing increased S. C. WOODS,`

in Width toward the open end of the core and G. G. CLARK. 

